/Engine/Source/Runtime/InstallBundleManager/Public/InstallBundleSourceInterface.h
Sets callbacks to Install Bundle Manager for dynamically discovered bundles UpdateCallback - Call to add or update bundle info from this source. Must be called when there are no requests for the bundle. LostRelevanceCallback - Allows bundle manager to clean up bundles if they are no longer relevant to any source
virtual void AsyncInit_SetUpdateBundleInfoCallback ( FInstallBundleSourceUpdateBundleInfoDelegate UpdateCallback, FInstallBundleLostRelevanceForSourceDelegate LostRelevanceCallback )